<!DOCTYPE html>
<hr lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
   <style>
       html{
           widows: 100%;
           height: 100%;
           text-align: center;
           overflow: hidden;
       }
       body{
           widows: 100%;
           height: 100%;
           margin: 0;  
           background-color: darkturquoise;
       }


       input{
           width: 70px;
           height: 5px;
           margin-bottom: 10px;
           padding: 10px;
           font-size: 13px;
           color: gainsboro;

       }
       .but{
           width: 90px;
           min-heigh:80px;
           display: block;
           line-height: normal;
           margin: 0;
           margin: 0px auto;


       }



   </style>
</head>
<div="logh">
<h1>登录界面</h1>
<input type="text" required="required" placeholder="用户名" name="u"></input>
<input type="password" required="required" placeholder="密码" name="p"></input>
<button class="but" tupe="submit">登录</button>
</div>
</body>
</html>